CZ20012122A3 - Method and apparatus for producing mop trimmings - Google Patents

Abstract

A method and an apparatus for producing mop trimmings from a twisted yarn (7) which is cut into pieces is described. In order to prevent any untwisting of the yarn pieces it is proposed that the twisted yarn (7) is subjected to a needling prior to cutting. The stitching base (1) is formed with yarn-receiving grooves extending in the longitudinal direction of the yarns.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a dust scraper fitting from twisted and chopped yarn.

BACKGROUND OF THE INVENTION

Yarns, especially cotton, have proven to be well suited for dust scraper, provided that the yarn does not twist due to the use of the dust scraper. However, as the yarn twists away from the cut free end, the cleaning effect of such a dust scraper shoulder is limited.

SUMMARY OF THE INVENTION

SUMMARY OF THE INVENTION The object of the present invention is therefore to provide a method for producing a dust scraper shoulder of the type mentioned above so as to avoid twisting the piece of yarn used in the dust scraper shoulder from its free end without compromising the cleaning effect.

The invention solves this object by subjecting the twisted yarn to the needling before cutting.

By twisting the twisted yarn, its twists remain effective so that the risk of shaking is advantageously avoided

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by twisting the pieces cut from the yarn without losing the cleaning effect, since the properties of the pieces of yarn required in connection with the installation of the dust wiper do not change by piercing. Since the yarns used can be continuously punctured prior to cutting, the additional cost can be kept comparatively low, moreover, the puncture density may not meet high requirements.

It is already known (U.S. Pat. No. 4,674,271 A, U.S. Pat. No. 5,081,753 A) to subject the yarns to needling, but these are continuous filament yarns to be broken by needling so that such yarns can be similar in nature to conventional staple fiber yarns . However, the known breaking of filaments by needles needled into the yarn does not disclose how the duster wiper should be handled in order to allow a long-term cleaning effect. Similarly, it is applicable to another known needling method (US 3 208 125 A), in which two filaments of continuous filaments are subjected to the needling process prior to twisting on the yarn to prevent the longitudinal displacement of the two filaments during twisting. However, this piercing prior to twisting does not prevent the twisting of the twisted fibers.

To perform the piercing of the yarns that can be used to fit the dust wiper according to the invention, it is possible to start from a conventional device with a needle plate driven back and forth in the piercing direction and with a suture pad opposite the needle plate. It must only be ensured that the yarn cannot deviate from the needles. For this reason, the needle plate is provided with at least one yarn guide groove running in the yarn direction, the needles of the needle plate being arranged along the guide groove. The yarn in the guide groove is avoided in a simple manner

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PV 2001 -2122 laterally protruding the pierced yarn so as to ensure that the yarn is pierced transversely to the longitudinal direction of the yarn. The needles can be arranged along the longitudinal axis of the guide groove in a row or offset transversely to this axis in order to adapt the puncturing conditions to the actual conditions. In order to pierce multiple yarns at the same time, the suture pad may have a plurality of parallel guide grooves for one yarn at a time. Trouble-free running-in and running-out of the yarns into the guide grooves, respectively. from the guide grooves, can be easily forced by the guide guides for the yarn.

secure in the direction

Of course, during the piercing, in order to pierce the material to be pulled out, the yarns need to be movable also by the pullers, which are the suture pad to pull off. This provided between the face side can be done by a needle plate and a facing needle plate. However, particularly advantageous conduction conditions are provided when the needle plate is not formed straight but convexly curved in the manner of the guide groove in a manner known per se, since in this case the force component which forces the yarn against the needle plate is adjusted under tension. , so making the downloader unnecessary.

BRIEF DESCRIPTION OF THE DRAWINGS FIG

The invention will be specific examples of which it represents closer design explained depicted via in the drawings; FIG according to invention to pierce twisted yarn in a simplified side

perspective,

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giant. 2 stitch pad device 1 in FIG viewed from above on a larger scale F giant. 3 sectional view according to plane III-III FIG scale and giant. 4 partial section according to plane IV-IV FIG scale.

DETAILED DESCRIPTION OF THE INVENTION

The device according to FIG. 1 consists essentially of a suture pad 11 and a needle plate g which is opposite the suture pad 7 and which is normally inserted into the needle beam 3 and can be driven back and forth in the needle stitching direction 5 '. In contrast to conventional suture pads, however, the suture pad according to the invention forms parallel guide grooves 6 for the yarns 7 to be pierced and which are held under tensile stress between the roller draw 8 and the roller draw 9. In order to guide the yarns 7, which can be unwound from the stock bobbins, guide loops 10 are provided on the inlet side of the roll flap 8. The same set of guide loops 10 is provided between the suture pad 1 and the roll flap 3. The lacquer can be seen in FIG. 4, the individual through holes 11 of the guide loops 10 in the suture plate 1 are spaced according to the guide grooves 6, so that a reliable yarn guidance is provided in the yarn direction 12.

Referring to FIG. 1, the suture pad 15 is formed convexly curved in the yarn direction 12, which, in connection with the tensile stresses exerted on the yarns 7 in the 8th roll, and

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9 exhaust cylinder lead to components of force perpendicular to the first substrate stitch yarns 1, therefore, these resulting forces are drawn into the guide grooves 6 and is pushed on the needle mat, so that the needles of the needle plate 5 _F 2 punched into the yarn 7, again of the yarns 7 without pulling the yarns 1 away. Therefore, a separate stripper between the needle plate 2 and the needle plate 11 is saved. The suture washer 7 is provided with respective through holes 13 for the needles 5, the embodiment according to the illustrated embodiment being realized so that the through holes 13 are aligned in a straight line in the longitudinal direction of the guide grooves 6 according to the same needle arrangement. Such alignment of needles, respectively. holes, however, is not necessarily needed. Thus, to increase the piercing effect, a slight offset of the needles 5 and the through holes 13 could be made transversely to the longitudinal direction of the guide grooves 6.

Due to the piercing of the yarns 7 transversely to the longitudinal direction of the yarn, the twist of the yarns is fixed over the entire pierced length of the yarn, so that the yarns can be cut into pieces without further risk without risk of fraying from the ends of the cuts. pieces of yarn as a dust wiper. Since the yarn piercing can be carried out continuously, the yarn piercing 7 can be performed during the operation of the dust scraper production line. However, it is of course also possible to rewind the pierced yarns so that they can be stored before further processing.

Represented by:

Dr. Miloš Všetečka v.r.

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Př MM

JUDr. Milos Všetečka Attorney 120 00 Prague 2, Hálkova 2

Claims (5)

A method for producing a dust scraper fitting from twisted and cut pieces of yarn, characterized in that the twisted yarn is subjected to puncturing prior to cutting. Apparatus for carrying out the method according to claim 1, with a needle plate operable in the stitching direction and with a suture pad opposite the needle plate, characterized in that the suture pad (1) has at least one guide groove (6) for the yarn (7) running in the yarn running direction (12) and that the needles (5) of the needle plate (2) are provided along the guide groove (6). Device according to claim 2, characterized in that the suture pad (1) has a plurality of parallel guide grooves (6) for each yarn (7). Device according to claim 2 or 3, characterized in that the guide groove (6) or the guide groove (6) or the guide groove (6) and / or the guide groove (6). the guide grooves (6) are upstream and downstream of the guide loops (10) for the yarn (7). Device according to one of claims 2 to 4, characterized in that the suture plate (1) runs convexly curved in the direction of the guide groove (6) in a manner known per se.